Our feelings, indulged without examination, will kill us. Feelings, intuition, and emotions are inputs that should be fully heard, but they must never govern our behavior. For those of us whose goal is happiness, it is only with the mind that we can see rightly, for what is essential is invisible to the heart.
— Eric Nolte, waxes philosophically over the importance of trusting flight instruments in Heart over Mind: The Death of JFK, Jr.